[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.212128] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 13.632041] random: sshd: uninitialized urandom read (32 bytes read) [ 13.845502] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.623457] random: sshd: uninitialized urandom read (32 bytes read) [ 14.762854] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.22' (ECDSA) to the list of known hosts. [ 20.279014] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 20.357377] BUG: unable to handle kernel paging request at ffffeafff9048020 [ 20.364775] IP: [] page_remove_rmap+0x37/0x6d0 [ 20.371019] PGD 0 [ 20.372966] [ 20.374587] Oops: 0000 [#1] PREEMPT SMP KASAN [ 20.379055] Dumping ftrace buffer: [ 20.382566] (ftrace buffer empty) [ 20.386255] Modules linked in: [ 20.389545] CPU: 0 PID: 3756 Comm: syz-executor680 Not tainted 4.9.122-g54068d6 #78 [ 20.397317] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.406671] task: ffff8801bd65e000 task.stack: ffff8801bb688000 [ 20.412723] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 20.421411] RSP: 0018:ffff8801bb68f948 EFLAGS: 00010246 [ 20.426856] RAX: dffffc0000000000 RBX: ffffeafff9048000 RCX: 0000000000000000 [ 20.434126] RDX: 1ffffd5fff209004 RSI: ffffffff814f5918 RDI: ffffeafff9048000 [ 20.441373] RBP: ffff8801bb68f970 R08: 0000000000034b00 R09: 0000000000000001 [ 20.448708] R10: ffff8801bd65e000 R11: 0000000000000001 R12: ffff8801bb68fc08 [ 20.455951] R13: ffffeafff9048020 R14: ffffeafff9048000 R15: 0000000000000001 [ 20.463201] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 20.471418] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.477320] CR2: ffffeafff9048020 CR3: 00000001c4efe000 CR4: 00000000001606f0 [ 20.484578] Stack: [ 20.486701] ffffeafff9048020 ffff8801bb68fc08 ffff8801c762d800 ffffeafff9048000 [ 20.494719] ffff8801bce8b420 ffff8801bb68f9c8 ffffffff8154cb8f ffff8801bb68fc18 [ 20.502720] ffff8801bb68fc10 ffff8801bb68fc88 00003ffe412001e0 00000001c762d000 [ 20.510727] Call Trace: [ 20.513298] [] zap_huge_pmd+0x16f/0x860 [ 20.518915] [] unmap_page_range+0x12ad/0x1730 [ 20.525035] [] ? vm_normal_page_pmd+0x310/0x310 [ 20.531329] [] unmap_single_vma+0x101/0x260 [ 20.537295] [] unmap_vmas+0x102/0x1d0 [ 20.542733] [] exit_mmap+0x214/0x3f0 [ 20.548071] [] ? SyS_munmap+0xa0/0xa0 [ 20.553498] [] ? up_write+0x1a/0x60 [ 20.558751] [] mmput+0xf3/0x2d0 [ 20.563655] [] do_exit+0x906/0x27b0 [ 20.568908] [] ? release_task.part.19+0x1210/0x1210 [ 20.575546] [] ? up_write+0x1a/0x60 [ 20.580796] [] ? do_mprotect_pkey+0x71d/0x890 [ 20.586918] [] ? mprotect_fixup+0x930/0x930 [ 20.592863] [] do_group_exit+0x111/0x340 [ 20.598553] [] ? do_group_exit+0x340/0x340 [ 20.604416] [] SyS_exit_group+0x1d/0x20 [ 20.610015] [] do_syscall_64+0x1a6/0x490 [ 20.615701] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 20.622596] Code: 55 41 54 53 48 89 fb e8 58 b4 e6 ff 4c 8d 6b 20 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 b8 05 00 00 <4c> 8b 73 20 49 89 dc 41 f6 c6 01 0f 85 4b 03 00 00 e8 23 b4 e6 [ 20.649548] RIP [] page_remove_rmap+0x37/0x6d0 [ 20.655875] RSP [ 20.659473] CR2: ffffeafff9048020 [ 20.662900] ---[ end trace b46159d75282f060 ]--- [ 20.667628] Kernel panic - not syncing: Fatal exception [ 20.673278] Dumping ftrace buffer: [ 20.676805] (ftrace buffer empty) [ 20.680489] Kernel Offset: disabled [ 20.684091] Rebooting in 86400 seconds..